In GtkSalFrame::UpdateSettings, we need to get an unused GtkSalGraphics instance with which to update the settings. To get the graphics, we call on GtkSalFrame::GetGraphics, however the semantics of this function are such that if it can't find an unused graphics then it will return NULL to let us know. Unfortunately, we don't do a NULL check, and just assume that it will always return a valid graphics pointer. Hence LO will crash.
Chris Sherlock committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=64fe9c6fd5888a7eeed34a20787d2d61da02378f fdo#74931 Prevent UpdateSettings from dereferencing null pointer The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.